/*
 * Copyright (C) 2007 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import java.util.Collection;
import java.util.Iterator;

import com.google.common.annotations.GwtCompatible;

/**
 * A collection which forwards all its method calls to another collection.
 * Subclasses should override one or more methods to modify the behavior of the
 * backing collection as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 * 
 * @see ForwardingObject
 * @author Kevin Bourrillion
 * @since 2010.01.04 <b>stable</b> (imported from Google Collections Library)
 */
@GwtCompatible
public abstract class ForwardingCollection<E> extends ForwardingObject
        implements Collection<E> {

    @Override
    protected abstract Collection<E> delegate();

    public Iterator<E> iterator() {
        return delegate().iterator();
    }

    public int size() {
        return delegate().size();
    }

    public boolean removeAll(Collection<?> collection) {
        return delegate().removeAll(collection);
    }

    public boolean isEmpty() {
        return delegate().isEmpty();
    }

    public boolean contains(Object object) {
        return delegate().contains(object);
    }

    public Object[] toArray() {
        return delegate().toArray();
    }

    public <T> T[] toArray(T[] array) {
        return delegate().toArray(array);
    }

    public boolean add(E element) {
        return delegate().add(element);
    }

    public boolean remove(Object object) {
        return delegate().remove(object);
    }

    public boolean containsAll(Collection<?> collection) {
        return delegate().containsAll(collection);
    }

    public boolean addAll(Collection<? extends E> collection) {
        return delegate().addAll(collection);
    }

    public boolean retainAll(Collection<?> collection) {
        return delegate().retainAll(collection);
    }

    public void clear() {
        delegate().clear();
    }
}
